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- 저자 : 이상준(Sangjun Lee) (검색결과 211 건)
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교차 편파를 이용한 MIMO 채널에서 1-비트 피드백 기반 OSTBC의 물리계층 보안 성능 분석
이상준,이인호,Lee, Sangjun,Lee, In-Ho 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.2
In this paper, we consider wiretap channels in the presence of an eavesdropper assuming spatially correlated MIMO(multiple-input multiple-output) channels, where we analyze a physical layer security performance of orthogonal space-time block code(OSTBC) using one-bit feedback assuming cross polarized antennas at each node. In this paper, we present a method to select a transmit-antenna group for OSTBC using one-bit feedback(O-OSTBC) and compare secrecy outage probabilities of various transmit-antenna grouping methods. Especially, we propose an efficient transmit-antenna grouping method by comparing secrecy outage probabilities of O-OSTBC and conventional OSTBC in highly correlated MIMO channels.
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레일레이 페이딩 채널을 고려한 듀얼 홉 디코딩 후 전달 중계 시스템에서 부분 중계 노드 선택 기법의 정확한 비트 오차율 분석
이상준,이인호,Lee, Sangjun,Lee, In-Ho 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.1
듀얼 홉 시스템에서 기존의 두 홉에 대한 채널 정보를 이용하여 가장 좋은 성능을 나타내는 중계 노드 선택 기법은 채널 피드백을 위한 자원의 소모가 크다. 본 논문에서는 듀얼 홉 디코딩 후 전달 중계 시스템에서 첫 번째 홉에 대한 채널 정보만을 필요로 하는 부분 중계 노드 선택 기법을 이용하여 정확한 평균 비트 오차율을 분석한다. 이 때, 독립적인 레일레이 페이딩 채널을 가정하여 M-ary QAM에 대한 정확한 비트 오차율의 표현식을 유도한다. 또한, 수치적 결과를 통해 두 홉에 대한 채널 정보를 이용하여 가장 좋은 성능을 나타내는 중계 노드 선택 기법과 부분 중계 노드 선택 기법에 대한 성능을 비교한다. 여기서, 중계 노드의 수와 첫 번째 홉과 두 번째 홉 간 평균 채널 전력비를 다양하게 가정하여 평균 비트 오차율을 분석한다.
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디코딩 후 전달 중계 시스템에서 부분 중계 노드 선택 기법 기반 기회적 협력 방식의 아웃티지 성능 분석
이상준,이인호,Lee, Sangjun,Lee, In-Ho 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.8
In this paper, we study the opportunistic cooperation scheme that improves the outage performance through the efficient selection between a cooperative mode and a non-cooperative mode. Especially, in decode-and-forward relaying systems, we analyze the outage performance for the opportunistic cooperation using partial relay selection, where closed-form expressions of exact and asymptotic outage probabilities are derived assuming independent and identically distributed Rayleigh fading channels. In the numerical results, we verify the derived expressions, and investigate the outage performances for various target data rates and different numbers of relays. Also, we compare the outage performances of the conventional cooperation scheme and the opportunistic cooperation scheme.
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New SPICE Modeling for Bias-Dependent Gate-Drain Overlap Capacitance in RF MOSFETs
이상준,이성현,Lee, Sangjun,Lee, Seonghearn The Institute of Electronics and Information Engin 2015 전자공학회논문지 Vol.52 No.4
The inaccuracy of the bias-dependent gate-drain overlap capacitance $C_{gdo}$ simulation in original BSIM4 and BSIM4 macro model using a diode is analyzed in detail. It is found that the accuracy of the macro model is better than of the BSIM4. However, the macro model cannot be used in the linear region. In order to remove the inaccuracy of the conventional models, a new BSIM4 macro model with a physical bias-dependent $C_{gdo}$ equation is proposed and its accuracy is validated in the full bias range.
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이상준(Sangjun Lee),정원삼(Wonsam Jung),배도제(Doje Bae) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
This study on a hollow type pinion electric power steering system using a high voltage of a Micro Electric Vehicle. A study was conducted on the design of applying a high voltage source of an electric vehicle to the circuit as it was, and developed a steering control logic for the Micro Electric Vehicle. This study is the result of verifying the applied data of high voltage source and the Micro Electric Vehicle electric power steering system different from the existing electric power steering system using the simulator.
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인솔 설계 변수에 따른 발목 과-회내 환자의 보행 시 좌우 방향 무릎 관절 하중의 변화
이상준(SangJun Lee),백승엽(Seung-Yeob Baek),손진규(JinKyou Son),김동욱(Dongwook Kim),이건우(Kunwoo Lee) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
The over-pronation of the knee joint causes the mechanical overloading transferred to proximal areas (i.e. ankles, knees, or hips) over time. Thus, the over-pronation is recognized as a contributory factor in a wide variety of musculo-skeletal pathologies in lower extremities. Commonly, over-pronated ankles are treated using specially designed insoles that support medial heels and correct the posture of lower limbs. However, the biomechanical effects of the insoles are not yet fully understood, so there still are controversies whether such insoles really have clinical significance. In this study, in order to verify the effects of insoles and determine the best shape of the insoles, we examined how the medio-lateral knee joint reaction force changes due to insole conditions. As shape parameters of insoles, the medio-lateral heel post angle and the arch support height were chosen. We then collected marker trajectories and ground reaction forces and moments of one male subject with overpronation walking with different insole conditions. The OpenSim software was employed for the simulation of each trial. Finally, the medio-lateral knee joint reaction force curves of each trial were plotted, and the efficacy of each insole condition was evaluated by comparing their peak values. As a result, it is revealed that the medial heel post, which drastically reduced the peak medio-lateral knee joint reaction force, has significant effects on the gait of the over-pronated patients. However, in case that the arch support is combined together, the positive effect of the medial heel post may rather decrease.
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